Superconducting properties of La2−xBaxCuO4
A. R. Moodenbaugh, Youwen Xu, M. Suenaga, T. J. Folkerts, R. N. Shelton
DOI 10.1103/PhysRevB.38.4596 · Physical Review B
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Abstract
We show that the superconducting transition temperature Tc of La2−xBaxCuO4 as a function of barium content (0≤x≤0.25, determined by mutual inductance measurements) has two maxima, both Tc≊25 K, near compositions x=0.09 and x-0.15. Between these two maxima is a local minimum (Tc about 5 K) for x=0.12. dc magnetization data are also reported for six compositions. Anomalies in electrical resistance appear near T=50–60 K at compositions 0.10≤x≤0.125. Many samples clearly show a second resistive superconducting transition near 30 K in addition to the bulk transition most clearly observed magnetically. The variation of Tc with composition is discussed in relation to the occurrence of resistance anomalies. The tetragonal lattice parameters at room temperature are consistent with previous work, and show no obvious anomalies. The sample preparation procedures are discussed in detail.
Source-reported materials — not catalogue approval
| Formula | Reported Tc (K) | Pressure (GPa) | Type |
|---|---|---|---|
| La2-xBaxCuO4 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 25 | Pressure not reported | onset |
| La1.855Ba0.145CuO4 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 25 | Pressure not reported | onset |
| La2-xSrxCuO4 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 40 | Pressure not reported | unknown |
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